20120021802 has 48 divisors (see below), whose sum is σ = 43772451840. Its totient is φ = 6679181376.

The previous prime is 20120021759. The next prime is 20120021813. The reversal of 20120021802 is 20812002102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5699574 + ... + 5703102.

It is an arithmetic number, because the mean of its divisors is an integer number (911926080).

Almost surely, 2^20120021802 is an apocalyptic number.

20120021802 is an abundant number, since it is smaller than the sum of its proper divisors (23652430038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20120021802 is a wasteful number, since it uses less digits than its factorization.

20120021802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4747 (or 4744 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20120021802 its reverse (20812002102), we get a palindrome (40932023904).

The spelling of 20120021802 in words is "twenty billion, one hundred twenty million, twenty-one thousand, eight hundred two".